Plug



May 8, 1928.

A., J. CARTER PLUG Filed July e, 1925 Patented May 8, 1928.

'UNITED STATES PATENT ori-lcs ALvA J. CARTER, or CHICAGO, ILLrNoIs,AssIGNOn To CARTER nanro COMPANY, or CHICAGO, ILLINOIS, A CORPORATION orILLINOIS,

PLUG.

Application med July e,

My invention relates to plugs and more particularly to an .electricalplug particularly useful in connection with radio receiving apparatus..y

Itis a purpose of my invention to provide a plug that is adapted forkcooperation with a 'jack such as used in connection with radioreceiving apparatus and telephone apparatus having a tip and a sleevethat are insulated from each other, said insulating means spacing saidtip and sleeve `from each other and being of smaller Vdiameter' thansaid tip and sleeve to prevent short circuiting of vthe plug across theinsulation. This short circuit iscaused frequently due to the fact thatthe metal of the springs forming the contacts of the jaclr is depositedon the insulating member due to the spring scraping overthe same thusmaking a line or continuous mark of a metal coating or deposition theinsulating member between the tip and the sleeve causing a short circuitbetweenthe tip and the sleeve. lBy setting the insulating memberinwardly, contact of the springs with the insulating member is preventedthus preventing the deposit of instal thereon. y

Y It is another' purpose of the invention to provide a plug of the abovementioned character that isprovided with the contacts seated in suitableopenings in the body portion of the plug With which the plugs orterminals are adapted to cooperate to connect the receiver or othersound reproducing 'da vice electrically with the tip and sleeve of theplug and to provide resilient means for forcing said plugs or terminalsinto engagement with said contacts.- Said yresilient means preferablycomprises a U-shaped insulating Lmember of flexible material between thelegs ofwhich is mounted a springtending to force the same apart-Preferably, the openings in the body portion ofthe plug are in the formof passages or channels that converge inwardlyk and are provided withabutments or fulcrums Opposite the contacts so that When the plugs orterminals on the receiver or other sound reproducing means arein'sertedand, engage: with the Ushaped member,` the resilient ineens tilts saidvter 1925. serien No. 41,692.

minals or plugs around the abutments or fulcrums to force the saine intoengagement with the contacts. The resilient means lies inwardly of theabutments and the con tacts lie outwardly thereof.

It is another purpose of the invention to provide a plug having a sleeveportion projecting therefrom with means for securing a contact theretoand to the body portion of the plug that simultaneously secures the Gsleeve to lthe body portion of the plug.

'Other objects and advantages of the invention will appear as thedescription of thc accompanying drawing proceeds. However'.7 l desire tohave in distinctly understood 65' that l do not intend to limit myselfto the exact details shown or described, ybut that l intend to includeas part of my invention all such obvious changes and modications n ofparts as would occur to a person skilled 7e with this art and as wouldfall within the scope of the claims.

1n the drawings: n

Fig.` 1 is a plan view of my improved plug with the cover removed;

Fig. 2 is a section thereof taken on the line 2-2 of F ig. 1 showing thecover in position; l Y Y I Fig. 3 is a perspective view of one of thecontacts usedrinm the plug; and p i Fig. 4 is a similar view of theother contact.

Referring in detail to the drawings, my improved plug comprises anybodyportion of insulating material which has a hollow S5 boss 11 projectingtherefronr* VrExtending outwardly-.from `the v boss 11v is the sleeveM12 of conducting materialuwhich is provided with ja reduced portion 13"top provide a shoulder 1&1 adaptedto engagewiththe out- 90 er end of theboss 11. Mounted withinthe outer end of the slee-ve 12 isan insulatingsleeve 15 having a reduced portion 1 6 entering the end of the sleeife1Q y.and an Ven- ,y larged portion ,17`of smaller diameter than 95 theouter diameterof the `sleeve 12. The sleeve 15 is provided forspacingthe ex,- tension 18y of the tip 19 from the sleeve 12. The tip1v9`is ofthe usual outer `contourfor n, tips of telephone plugs and is providedWith 100l a cylindrical portion 2O ot substantially the same externaldiameter of the sleeve 12. blaid tip is further provided with a concaveannular groove 21 tor receiving the convex end 22 oi the insulatingmember' 15.

Contact 23 having the fiat ear 24 thereon lying adjacent the inner :tace25 ot' the lz-ody portion 1l) is provided in said plug. trl-aid contact23 is secured in electrical contactwith the sleeve 12 and the sleeve 12and the Contact 23 are secured to the body portion by upsetting orriveting over the sleeve 12 as indicated at 25 thus clamping the contact23 and the boss 11 between the shoulder 14 and the head E25 on thesleeve 12.

rEhe body portion 10 is provided with a pair of channels 25 and 27 thatconverge troni the open end thereof toward the inner portion ot the plugand open up into the einarged recess or opening 28 which lies on theopposite side ot' the central opening .in the boss 1l from the passages26 and 2T. The Contact 23 lies in the passage 26 and isprovided with a.right angular end portion or linger 28 projecting into the passage 26.

rilhe extension 1S has an insulating sleeve 2S mounted thereon whichprovided with :i reduced end portion fitting between the ste-ni 18 andthe sleeve 12 to space the same at the inner ends thereof. The inner endot the member 18 is threaded as indicated at 30 and the ear 3l on thecontact member 32 niounted thereon in engagenient with the insulatingsleeve 28, said sleeve spacing the contacts Q3 and trom each other. rlhenut 33 screw-tlireadedly engziiges with the 'threaded end El() oit themember 18 to clamp the contact 23 in cngagcnieut "herewith The cars 2land 3l ot the contacts "ill and 32 lio in a recess bfi; termed beu'ecuthe wall 55 and the projeclion .fili ot the body portion 1li, the sidewalls oli said ears converging' as indicated at il? and and and lllrespectively. The nuts ot the ears are rounded as indicated at ll andelf. and Si and i4 respectively to contorni to the curved faces ot theprojection titi and the wall 35. The ear 2l is provided with an openingLi5 ot a to receive the sleeve 1:2 and the car Si is provided with anopening et@ ot a size to receive the stom 1S. The contact 8;? isprrwidcd with a projection or linger Ll? corresponding to the linger 28on the contact Q3 and lios in the. opening or passage 27.'

Mounted between the ears :25 and 31 and having a curved bight portion eSis the ll-shaped insulating member 49 which is provided with tlaring legportions 50. rihe curved portion 48 thefeorp lies substantially inyement i h the carved wall portioz' o a coiL compression spring 5l liesbetween the legs 5l) of the member 49 between the projection 36 and therear wall portion oi the plug. An inward projection j irovided on thewall portion 5:2 to hold the spring 5l in position. The movement ot themember L19 sidewise is limited by engagement ot the legs 50 with theconverging walls 54 ot the recess 2S.

vit will be noted that ol'tsets or abutnients are provided at 55 betweenthe converging wail portions 5l and the converging wall portions 5G otthe passages 26 and 27. Upon retort to l? ig. 1 it will be seen thatwhen the plu s or terminals 57 having the reduced end portions or tips58 are inserted in the openings 2T and 26, the extreme end portionsthereof will lirst engage with the member Li9 as shown at the left otFig. 1, the enlarged rear portion of the plug 57 sliding over the lingerel? or Q8, as the case may be, ol" the Contactin the passage. Thiscontinues until the end oit the enlarged poltion of the plug or terminal57 passes the finger on the Contact 23 or 32 whereupon the same willtulcrum around the abutment due to the action ol" the spring 51 causingthe plug to snap in back of the nger on the contact as shown at theright of Fig. 1. thus securely locking the terminal in position andmaking a good contact between the terminal on the conductor 59 and the-ontact Q3. lllhen it is desired to disen 'age the terminal or plug 5rfrom the cona with which it is in engagement, all -lia is necessary isto pull the same laterily away trom the center oiI the plug compressingthe spring 51 and tilting the member 5l so that the enlarged end thereofwill pass the iingeron the contact.

The plug is closed by means of the insulating cover member 6() whichengages with the body portion l() and which is provided with a. centralrecess lll to provide room Ytor the members Elli and Any suiti ablesecuring de rices are. used tor securing the cover (il) on the bodyvportion il), the openings (l2 being provided in the body por tion llltor the recept-ion ot said securing means.

liiaving thus described my invention what l desire to claim and secureby United States Letters Patent is:

1. 1n a plug` ol' the character described, an insulating body portion, apair of contacts mounted therein, terminal receiving openings in saidbody portion in which said contact-s lie and resilient means tor movingthe terminals in said openings into engagement with said contactscomprising a U- sbaped flexible member having a spring mounted betweenthe arms thereof.

2. In a plug of the character described, an insulating body portionhaving a pair of converging passages therein, a Contact lying adjacentone oi the walls ot each of said passages, and resilient means engagingterininals inserted in Said passages to move l'lie saine into engagementwith said contacts.

In a plug' of the Character described, an insulating body portion havinga pair of converging passages therein., a Contact lying adjacentone ofthe Walls of each of said passages, an abutment on the walls of each ofsaid passages opposite said contants, and resilient means engagingterminals inserted in said passages inwardly of said abutnients to forcesaid terminals into engagement with said concacts.

In Wit-ness whereof, I hereunto subscribe my naine this 2d day of JulyA. D., 1925.

. e ALVA J. CARTER.

